This volume comprises the first comprehensive grammar of a language from the Aslian subgroup, within the Mon-Khmer branch of the Austroasiatic family. Spoken by approximately 4,000 people in the lowland forests of the Malay Peninsula, Semelai has many distinctive features of interest to linguistic typologists, phonologists, morphologists and syntacticians. The volume provides a unique reference resource for South-East Asian language specialists, as well as general linguists.